Piston-valve.



No. 677,932. Patented -1uly 9, 190|.

.1. T. HEFFERNAN.

PISTUN VALVE.

Applcatian lad. Jim. 18, 1901.)

(NoModal.)

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21j-@TENT .OFFIQE# JOHN T. HEFFERNAN, OF SEATTLE, WASHINGTON.

PISTON-VALVE- SPECIFICATION forming part of Letters Patent N0. 677,982, dated July 9, 1901.

Application iled January 18, 1901. 4Serial No. 43,775. (No model.) l v To all whom t may concern:

Be it known thatl, JOHN T. HEFFERNAN, a citizen of the United States, residing at Seattlein the county of King and State of Washington, have invented certain new and useful Improvements in Piston-Valves, of which the following is a specification.

My invention relates to piston-valves; and it has for its object to provide a new and improved construction whereby such val ves will be steam-tight and whereby they will be free in operation and not liable to get out of order or to Wear or stick; and to these ends my invention consists in a piston-valve embodying the features of construction arranged and operatin g substantially as hereinafter more particularly set forth.

v l Referring to the accompanying drawings,

Figure 1 is a vertical longitudinal section through the steam-chest and valve, showing the construction and arrangement of the parts. Fig. 2 is a part end and part sectional View showing the bridges and ring attached to the end of the valve; and Fig. 3 is an end view of the lining or bushing, showing rings in dotted lines.

In the use of piston-valves it is very important that they should be steam-tight andat the same time that they should be so constructed and arranged that they will not bind or produce too much friction, and it is the object of my present invention to provide a piston-Valve which shall be simple, cheap, and effective in construction and which shall avoid the objections named, and Ihave illustrated a preferred embodiment of my invention in the accompanying drawings.

Referring to the drawings, 1 represents-a valve-chest having ports or passages 2 2 lead-V` ing to a steam-cylinder 3, and these ports are controlled by the valves 4 4, connected together in the present instance by a rod 6. Each of these valves consists of a body portion 5, forming the valve proper, and extending on opposite sidestherefrom are a series of arms or bridges 7, and these are preferably joined at their outer ends by a ring 8, and in actual construction all these parts are preferably cast or formed in one piece.

Arranged in connection with each valve are the valve-linings 9 9a, which may be of any =cesses or grooves 12 in the inner face of the lining, and in these recesses or grooves are lsprung thev packing-rings 13, in the present :instance two being-shown on each side of the port 11'; but the number of rings of course can Vary according to the requirements of any par'- ticular case. These rings are slightly smaller than the face or circumference of the valvebody 5, and in order to aid in holding them up against the surface of the' valve I construct the lining or bushing so that the rings will not be subjected topressure from the high-pressure steam, which` would tend to set the rings in the grooves. In order to accomplish this, I have shown the linings or bushings 9 as provided with a passage 14, opening into theeXhaust-chamber 15 ofthe steamchest, and connected with this passage 14 is an opening 16, leading to each groove or recess 12 in the lining, and when two packing- .rings are used, as shown, I preferably arrange this opening near the adjacent sides of the two rings, as shown.

This being the lgeneral construction of the valve, its operation will be readily understood, and it. will be seen that the rings 13 13, arranged on either side of the port 11 in grooves in the bushing, bearupon the valve-body 5 and make a steam-tight joint, Vand they are subjected to pressure from the exhaust-steam through the passage 14 andthe opening 16 into the grooves in the face of the bushing. The arms or bridges 7, extending on either side of the body of the valve, serve to retain the packing-rings in position as the valve reciprocates in one direction or; the other, and the ring 8 maintains the arms or 'bridges in proper relation and prevents theirl bending or yielding, while they interfere in no practical way with the passage ofthe steam or other fluid through the valve. I

It will be understood, of course, that the form of the rings can be varied and any number of them can be used according to the requirements of any particular case and still embody the essential features of my inven- IOO l. The combination with a steam chest and valve, of a bushing provided with grooves having rings arranged in the grooves, and passages connecting the grooves with the exhaust-chamber of the steamchest, substantially as described.

2. The combination with a steam chest and valve, of a bushing provided with a steamport and grooves arranged on either side of the steam-port, packingJi-ings arranged in the grooves, a passage in the bushing communieating with the exhaust-port, and openings from the passage to the grooves, substantially as described. I Y

3. The combination with a steam-chest, of a bushing having grooves in its inner face, packing-rin gs arranged in the grooves, a valve provided with bridges extending therefrom, and a ring supporting the outer ends of the bridges, substantially as described.

4. The combination with a steam-chest, of a bushing having a steam-port and recesses GII-either side, packing-rings arranged in the recesses, a passage communicating with the ysaid recesses and with the exhaust-port, and

a valve having bridges extending on either side thereof, the bridges being connected to a ring at their outer ends, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

JOHN T. HEFFERNAN.

Witnesses:

L. J. VETLENTHAL, JOHN J AMES; 

